Well the moonphase must be an uncommon additional complication - very nice indeed. Someone else may know more, of course.The watch is only 30mm in diameter, so the movement has to be approx. 26-28 mm I guess. I think Marrick could be right, but some parts do look a bit different to my untrained eyes. Moon phase definitely works and date and day changes automatically.
It's interesting to compare the different finishing done by the various assemblers:
Your is somewhere between the two examples in the Ranfft archives, having the movable hairspring stud, centre wheel jewel and cap-jewel on the escape wheel, but having the smaller screw-compensated balance wheel.
Regarding the complications; I wonder if there was another maker producing triple-date modules to fit the ETA 1100 series?
It would have been no challenge to add a 59 teeth disc advanced twice a day to the ETA 1164, but I never saw it, neither in the real world nor in any records. Zodiac used a module with calendar and moon phase on the ETA 1100:I wonder if there was another maker producing triple-date modules to fit the ETA 1100 series?
With no brand markings or other help in what is stamped inside the case back, I'm not sure what else to suggest. (And I see that you had already supplied that information before I asked for it.)Roland, thank you very much for the info on that Zodiac. Very interesting stuff.
Rdenney, I guess that onion crown is design from earlier periods, but I think that few manufacturers used it as a design feature through many years? Correct me if I am wrong.
Unfortunately I do not know much about watch history, so cant tell for sure if it was re-cased or not. Case back is definitelly made out of steel, and on the inside it is stamped '5437', and on the outside (back) it is stamped 'swiss 12-701'.
One more info, day is in german, but I guess that doesnt tell much...
Here are some more pictures, with crown detail:
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